Problem A jet propulsion unit working with the Joule cycle uses an air/fuel ratio of 100:1, the calorific value of the fuel being 4.184 x 104(kJ/kg).

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Problem

A jet propulsion unit working with the Joule cycle uses an air/fuel ratio of 100:1, the calorific value of the fuel being 4.184 x 104(kJ/kg). Air is taken in at pressure 1 bar and temperature 300 (degree K), and is compressed to pressure 3.5 bar. The fuel is then injected in the burner at constant pressure after which it is expanded adiabatically to pressure 1 bar. The air is then cooled back to its initial state. Find: (1) the ideal efficiency of the cycle, (2) the compression ratio, (3) the temperature at the beginning and end of the adiabatic expansion. Neglect the effect of friction.